Lathe.



C. L. W. TUQKER.

LATHE. APPLICATION FILED FEB. 2% I915.

Patented Oct. 3,1916.

3 SHEETSSHEET I.

C. L. W. TUCKER.

LATHE.

APPLICATION HLED FEB. 244 916- 1,200,053. Patented Oct. 3,1916. I 3 SHEETS-SHEET 2.-

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W T I Mafia C. L. W. TUCKER LATHE.

APPLICATION FILED FEB. 24. I916.

Patented M13, 1916'.

3 $HEET$-SHEET 3 1M: NORRIS PEYERS 0a., mmmumo WASHING mm D. c,

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i CYBIL LESLIE WILLIAM TUCKER, PIGCADILLY, WESTMINSTER, ENGLAND.

. LATHE.

Specification of Letters Patent.

I Application filed February 24,- 1916. Serial No. 80,214.

To all whom it may concern:

' which the following is a specification.

This invention relates to semi-automatic high speed lathes of the kind provided with a tool holder carrying a plurality of tools and capable of rotating about an axis parallel to the axis of the headstock spindle or mandrel to bring each tool into its operative position, such rotation being determined by stops, and in which the work is moved toward and away from the said tool holder during the operation of the various tools,

such movement also being determined by stops, the object of the said invention being to provide alathe of this type which is of simpler construction and cheaper to manufacture than such lathes as hitherto constructed. In the accompanying dra'wingz-Fig'ure l is a sectional side elevation of a lathe constructed according to my invention. Fig. 2 is a sectional plan of the same, and Fig. 3 is an end elevation. Fig. .4 is a section onthe line H, Fig. 1. Fig.5 is a side view of a modified detail, and Fig. 6 is a sectional view at right angles to Fig. 5. a is the lathe bed which I form of a round bar clamped in brackets or uprights b, b, the upper portions of which constitute a headstock and provided with bearings 0,, c for the mandrel or spindle d. This mandrel, which is preferably tubular and provided with a jaw or other chuck, not shown, at the end (P to hold the work to be operated upon, has the driving pulley e loosely mounted upon it between collars c and is provided' with a dog (or dogs) 6 designed to cooperate with another dog 7 (or dogs) on what I term a driving plate 7 keyed to the mandrel so as to rotate therewith, but capable of longitudinal movement on the keys which are indicated at 7. WVhen thetwo dogs 6? and f are in engagement motion will be communicated to the mandrel (Z from the pulley 6, while when the mandrel is moved longi tudinallyso as to disengage the said dogs, the rotation of the driving plate and of the mandrel will cease.

The motion of the driving plate f by hand, to cause the engagement and disen gagement of the dogs 6 and) is effected by a sliding handle 9 through the medium of a segment 9 engaging a groove 9 in the said driving plate.

I The longitudinal movement of the mandrel d for screw cutting or other purposes is effected by means of externally screw-threaded sleeves fixed tothe said mandrel and designed to be engaged'by sectional nuts or chasers mounted on the headstock. Where two threads of varying pitch are required upon a single article to be machined two of such screw threaded sleeves of the required pitch aresecured to the mandrel, as indicated at h, h the sectional nuts or chasers z, 2 being carried upon the opposite ends of pivoted levers 9', two of which levers are arranged on opposite'sides of the mandrel. These levers are'pivoted to the headstock at f, y at a point midway between their ends so that when one set of chasers, for instance, the chasers i are engaged with the screw threaded sleeve 71., the other chasers i are moved away from their screw threaded sleeve h and vice versa. For locking either of the chasers i or i in engagement with their respective screw threaded sleeves a pair of levers 70, k on a common shaft 76 pivoted to the headstock are employed, the said levers bearing against the outer surfaces of the levers j,- j which are provided with the double inclines as shown, so that if the levers 7 be moved either to the right or left they will ride against the inclined surfaces and cause one end of the said levers j to move toward the mandrel, while the other ends will be moved away from the mandrel. In

the drawing the levers 7c are shown in the Intermediate position in which neither chaser is in engagement with its screw threaded sleeve, and for the purpose of manipulating the said levers it one of them is extended upwardly, as indicated at 73 to'constitute a handle.- I p In order that the mandrel cl may be moved longitudinally by hand I employ a forked lever 70 carrying the ring segments 70* located in the groove of a collar k fixed to the mandrel, the said forked lever being fulcrumed at k to one end of a link is, the other end of which is pivoted at 70 to the head stock. v

Z is the tool holder which is fixed to a sleeve Z rotatable upon one end of the bed bar a, the said tool holder being of disk shape and provided with a groove m upon its periphery to carry a series of micrometer Patented Oct. 3, 1916.

stops m which serve to determine the position of the tool holder circumferentially as it is partially rotated from time to time to bring the several tools which it carries into their operative position.

The groove m is advantageously of T-form with which the head of a bolt m engages, the said bolt passing through the body of the stop m which is of semicircular form and adapted to seat itself on the periphery of the tool holder Z which is correspondingly formed hollow to receive it, the bolt m being secured by a suitable nut as indicated.

Projecting from the body of the stop m in the plane of the disk Z is a screwed stud it upon which is screwed a grooved collar n and secured thereon by a lock nut 71?, the collar 71- forming the stop proper. The stops on cooperate with a fixed stop 0 which is in the form of a lever pivoted at 0 to a bracket 0 secured to the table or other surface to which the brackets b of the lathe are secured. The said lever 0 is formed at its upper end with a tooth 0 designed to engage either of the grooved collars n to hold the tool holder in the required position for use.

To facilitate the operation of the lever o it is provided with a handle 0 for disengaging it from the grooved collars a a spring 0 being arranged on the bracket 0 and bearing against a tail on the said lever to hold the tooth 0 in engagement with the grooved collars n For clamping the tool holder rigidly when the lever 0 is engaged with either of the micrometer stops m 1 advantageously provide a screw p engaging a screw threaded hole in the bar a, the head of the screw, which is formed with a suitable operating handle 79 bearing against a washer 39 one face of which is in contact with one face of the disk Z, so that when the said handle 72 is turned in one direction it will cause the washer to exert great pressure upon the disk Z and thus clamp it rigidly to the bar a.

g, 9 indicate portions of some of the tools or of their holders proper, the shanks q of which are fixed in an endless slot 7' in the disk Z, this slot being formed by making the outer part of the said disk separate from the inner part, as clearly shown in Fig. 3, and it enables a tool to be adjusted to any required position around the disk Z instead of being limited to certain positions as has hitherto been the practice where the tools are carried in holes in the disk. Although the disk Z is, by the formation of the slot 1', formed in two independent parts they are nevertheless maintained concentric and locked together by the shanks which are all made of one gage so as to form distance pieces between the two parts, the

tightening nuts g on the said shanks looking the parts of the disk firmly together by clamping them between shoulders Q3 on the parts (1 and washers q.

In order that the travel of the mandrel (Z, under the action of either of the feed screws h or 7L1, shall in all cases agree with the duty to be performed'I provide in relation with each tool a stop .9 in an endless slot 3 in the 'tool holder Z against which stop a rod 25,

carrying the handle 9, impinges when the driving plate 1 has been longitudinally moved to that extent. The further longitudinal movement of the said driving plate is thus arrested whereby after a further definite movement of the mandrel (Z, with relation to the driving plate, has taken place, the dogs 6 and f will become disengaged and the rotation of the mandrel consequently cease.

In some cases it may be necessary to impart a slight rotary motion to the disk Z, for instance, when cutting screw-threads, in order that the chasing tool may be advanced to cut deeper into thework and for this purpose the pivot 0 of the stop 0 may be formed or provided with an eccentric u as indicated in Figs. 5 and 6 on which the said step is pivoted. By the rotation of this eccentric it will be seen that the stop 0 when in engagement with the disk Z will cause a slight rotary movement of the said disk. For efiecting this rotation of the eccentric u the pivoto is provided with a handle 4).

Claims:

1. In a semi-automatic lathe the combination with a longitudinal movable mandrel and a headstock carrying the said mandrel, of a rotary tool holder comprising an inner disk part and an outer ring section of larger internal diameter than the disk so that a space is left between the two parts which constitutes a slot, and tools or tool holders having shanks fitting into the said slots and constituting distance pieces and clamping means.

2. In a semi-automatic lathe the combination with a longitudinally movable spindle and a headstock carrying the said spindle of a rotary tool holder made in two parts and comprising an inner disk section and an outer ring section provided with a pcripheral slot and of adjustable stops designed to be fixed in the said slot.

8. In a semi-automatic lathe the combination of a fixed headstock a mandrel longitudinally movable therein, a rotary tool holder having a peripheral slot, adjustable stops fixed in the said slot and a fixed stop with which the peripheral stops are designed to engage, the said fixed stop being hinged to allow of its being moved into, or out of, the path of the peripheral stops when the tool holder is rotated.

41;. In a semi-automatic lathe the combination of a fixed headstock, a mandrel longitudinally movable therein, a rotary tool holder having a peripheral slot, adjustable stops fixed in the said slot, a fixed stop With which the peripheral stops are designed to engage, the said fixed stop being hinged to allow of its being moved into, or out of, the path of the peripheral stops When the tool holder is rotated, and an eccentric upon Which the said fixed stop is pivoted.

5. In a semi-automatic lathe the combination With the headstock and a spindle mounted in the said headstock and adapted to move longitudinally therein of screwthreaded sleeves fixed upon the said mandrel, double ended levers pivoted on opposite sides of the axis of the mandrel and means for simultaneously engaging the said Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

